Some 15 years ago, when Utah State University ecologist Daniel MacNulty told his faculty advisor he planned to watch wolves hunt bison in a remote area of Yellowstone National Park, the latter shook his head.

Yellowstone National Park has two of the last remaining large herds of pure-bred bison in North America, but moving them out of the park to reproduce has been tough with public concerns over their widespread ...

(AP) -- Yellowstone National Park's iconic bison herds are suffering their worst winter in several years with almost 400 of the animals being held for possible slaughter - and a much-heralded initiative to ...

Last winter, government agencies killed one third of Yellowstone National Park's bison herd due to concerns about the possible spread of a livestock disease to cattle that graze in areas around the park. Such drastic measures ...